Troubleshooting Guide - IBM L180p Service Manual

NO POWER
(POWER INDICATOR OFF)
CHECK J705
VOLTAGE
PIN6, PIN7 (5V)?
YES
CHECK
U803 PIN 3
VOLTAGE
(5V) ?
YES
CHECK
U804 PIN 3 Voltage
(5V) ?
YES
CHECK KEY CONTROL
CONNECTOR ROUTINE
IS U201
PIN114 (3.3V)
VOLTAGE REPEATED
AS PULSE
SHAPE ?
YES
CHECK IIC LINE
CONNECTION
(U501, U502)

TROUBLESHOOTING GUIDE

1. NO POWER
NO
NO
NO
NO
CHECK U201 VCC,
- 12 -
CHECK POWER
BOARD, AND FIND
OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK U803.
CHECK 5VS LINE
(OPEN CHECK)
NO PROBLEM